From 88b9b9652ab77f91eaa7c6e40b8a48e3a35a7948 Mon Sep 17 00:00:00 2001
From: red-001 <red-001@outlook.ie>
Date: Thu, 6 Apr 2017 21:50:45 +0100
Subject: [PATCH] [CSM] Add function to get the server protocol version.
 (#5529)

---
 clientmods/preview/init.lua     | 1 +
 doc/client_lua_api.md           | 3 +++
 src/script/lua_api/l_client.cpp | 8 ++++++++
 src/script/lua_api/l_client.h   | 3 +++
 4 files changed, 15 insertions(+)

diff --git a/clientmods/preview/init.lua b/clientmods/preview/init.lua
index 07464e927..3c96fae55 100644
--- a/clientmods/preview/init.lua
+++ b/clientmods/preview/init.lua
@@ -69,6 +69,7 @@ core.after(2, function()
 	print("[PREVIEW] loaded " .. modname .. " mod")
 	modstorage:set_string("current_mod", modname)
 	print(modstorage:get_string("current_mod"))
+	print("Server version:" .. core.get_protocol_version())
 	preview_minimap()
 end)
 
diff --git a/doc/client_lua_api.md b/doc/client_lua_api.md
index 25055c98a..6d62de8a2 100644
--- a/doc/client_lua_api.md
+++ b/doc/client_lua_api.md
@@ -696,6 +696,9 @@ Call these functions only at load time!
 * `minetest.disconnect()`
     * Disconnect from the server and exit to main menu.
     * Returns `false` if the client is already disconnecting otherwise returns `true`.
+* `minetest.get_protocol_version()`
+    * Returns the protocol version of the server.
+    * Might not be accurate at start up as the client might not be connected to the server yet, in that case it will return 0.
 
 ### Misc.
 * `minetest.parse_json(string[, nullvalue])`: returns something
diff --git a/src/script/lua_api/l_client.cpp b/src/script/lua_api/l_client.cpp
index 458c1d1f4..0f4d7eaae 100644
--- a/src/script/lua_api/l_client.cpp
+++ b/src/script/lua_api/l_client.cpp
@@ -234,6 +234,13 @@ int ModApiClient::l_sound_stop(lua_State *L)
 	return 0;
 }
 
+// get_protocol_version()
+int ModApiClient::l_get_protocol_version(lua_State *L)
+{
+	lua_pushinteger(L, getClient(L)->getProtoVersion());
+	return 1;
+}
+
 void ModApiClient::Initialize(lua_State *L, int top)
 {
 	API_FCT(get_current_modname);
@@ -251,4 +258,5 @@ void ModApiClient::Initialize(lua_State *L, int top)
 	API_FCT(get_meta);
 	API_FCT(sound_play);
 	API_FCT(sound_stop);
+	API_FCT(get_protocol_version);
 }
diff --git a/src/script/lua_api/l_client.h b/src/script/lua_api/l_client.h
index 4e7f63d6a..478b8ed6c 100644
--- a/src/script/lua_api/l_client.h
+++ b/src/script/lua_api/l_client.h
@@ -69,6 +69,9 @@ private:
 
 	static int l_sound_stop(lua_State *L);
 
+	// get_protocol_version()
+	static int l_get_protocol_version(lua_State *L);
+
 public:
 	static void Initialize(lua_State *L, int top);
 };